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earth_global_warming June 11, 2008

Yesterday, the United Nations released its 350-page atlas, Africa: Atlas of Our Changing Environment, selling for $150, which pictorially depicts the stark changes occurring in each of that continent’s 53 nations.  The non-copyrighted material  contains over 300 satellite images, over 150 maps, and over 300 ground photographs, from as far back as 1942. Released in English and in French, the digital version will be uploaded to Google Earth and other websites in the future.

Through a combination of ground photographs, current and historical satellite images, and narrative based on extensive scientific evidence, this publication illustrates how humans have altered their surroundings and continue to make observable and measurable changes to Africa and its environment.

President Thabo Mbeki of the Republic of South Africa, who is hosting the African Ministerial Conference on the Environment in Johannesburg, launched the book, as leaders meet to discuss policy initiatives that seek to develop climate-proof economies.

Although Africa produces only four per cent of the world’s total carbon dioxide emissions, its inhabitants are poised to suffer disproportionately from the consequences of global climate change.

Mass human migration, a topic not usually highlighted in global warming discussions, adds further stress to the environment as people flee ongoing resource wars, and, increasingly, in pursuit of food and water. Urbanization creates its own feedback loop as drought conditions force farmers into cities that continue to expand into former farmland, further depleting food supplies. 

Satellite images from 1976 and 2006 reveal that half the famous “Snows of Kilimanjaro” have melted. Mt. Kilimanjaro borders Tanzania and Kenya. Other lesser known changes include: 

* Uganda’s disappearing glaciers (by half in the past 20 years);

* Madagascar’s deforestation;

* Western Sudan’s loss of vegetation to accommodate refugees fleeing Darfur;

* Mass delta erosion comprising the bulk of Africa’s soil loss calculated at 50 metric tons per hectare (2.47 acres) per year;

* Erosion and chemical and physical damage degrade 2/3 of * Africa’s farmlands; and

* Denuded forestland and large loss of biodiversity.

African forests are disappearing at twice the world’s deforestation rate, estimated at more than 4 million hectares per year (or about 1 billion acres a year). 


African Deforestation Rates 2000-2006

But not all findings are negative, exposing positive impacts from proper resource management: 

Tunisia: near-extinct Scimitar-horned oryx (Oryx dammah) reintroduced in formerly overgrazed lands;

Zambia: better dam management restored natural seasonal flooding of the Kafue flats;

Mauritania: massive wetlands restoration project now lessens flood impact and improves local livelihoods;

Kenya: strict enforcement of sustainable forestry improved hydro-power generation.

While US media, including the “science” channels, continue to present human-caused climate change as a question rather than a foregone reality, the earth continues to warm, causing drastic changes in weather, agriculture and water supplies. African leaders are well advised to rely on scientific evidence in guiding policy decisions.